21288120

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{25343}}^1$

素因数の和:25364

約数の個数: 64

約数和(自身を含む): 72990720

約数和(自身を除く): 51702600

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840, 25343, 50686, 76029, 101372, 126715, 152058, 177401, 202744, 253430, 304116, 354802, 380145, 506860, 532203, 608232, 709604, 760290, 887005, 1013720, 1064406, 1419208, 1520580, 1774010, 2128812, 2661015, 3041160, 3548020, 4257624, 5322030, 7096040, 10644060, 21288120]

約数ペア:

[(1, 21288120), (2, 10644060), (3, 7096040), (4, 5322030), (5, 4257624), (6, 3548020), (7, 3041160), (8, 2661015), (10, 2128812), (12, 1774010), (14, 1520580), (15, 1419208), (20, 1064406), (21, 1013720), (24, 887005), (28, 760290), (30, 709604), (35, 608232), (40, 532203), (42, 506860), (56, 380145), (60, 354802), (70, 304116), (84, 253430), (105, 202744), (120, 177401), (140, 152058), (168, 126715), (210, 101372), (280, 76029), (420, 50686), (840, 25343)]